/*
 * Version.java July 2008
 *
 * Copyright (C) 2008, Niall Gallagher <niallg@users.sf.net>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package wx.xml.simpleframework.xml;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * The <code>Version</code> annotation is used to specify an attribute
 * that is used to represent a revision of the class XML schema. This
 * annotation can annotate only floating point types such as double,
 * float, and the java primitive object types. This can not be used to
 * annotate strings, enumerations or other primitive types.
 *
 * @author Niall Gallagher
 */
@Retention(RetentionPolicy.RUNTIME)
public @interface Version {

    /**
     * This represents the name of the XML attribute. Annotated fields
     * or methods can optionally provide the name of the XML attribute
     * they represent. If a name is not provided then the field or
     * method name is used in its place. A name can be specified if
     * the field or method name is not suitable for the XML attribute.
     *
     * @return the name of the XML attribute this represents
     */
    String name() default "";

    /**
     * This represents the revision of the class. A revision is used
     * by the deserialization process to determine how to match the
     * annotated fields and methods to the XML elements and attributes.
     * If the version deserialized is different to the annotated
     * revision then annotated fields and methods are not required
     * and if there are excessive XML nodes they are ignored.
     *
     * @return this returns the version of the XML class schema
     */
    double revision() default 1.0;

    /**
     * Determines whether the version is required within an XML
     * element. Any field marked as not required will not have its
     * value set when the object is deserialized. This is written
     * only if the version is not the same as the default version.
     *
     * @return true if the version is required, false otherwise
     */
    boolean required() default false;
}
